A beautiful gypsy woman pleaded guilty in Manhattan yesterday to poisoning and swindling a wealthy husband 57 years her senior.

Sylvia Mitchell, 35, of Las Vegas, admitted in Supreme Court that she fed lethal drug cocktails to her husband, real-estate investor Andrew Vlasto, 85 – killing him only three months after their 1993 marriage.

She faces up to 15 years prison when she’s sentenced July 6 for reckless manslaughter.

Mitchell was never charged with murder because Manhattan prosecutors believe she didn’t intend to kill Vlasto – only to keep him foggy-headed as she plundered his $500,000 worth of bank accounts and property here and in his native Greece.

She began poisoning him soon after they were married in 1993, and continued dosing him right up to his death at Bellevue Hospital in November 1993.